JP2504952B2 - Anti-theft device for automobile - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-theft device for an automobile in which a warning is controlled by a locking device such as an automobile door or a trunk.

2. Description of the Related Art An example of an anti-theft device for a vehicle is disclosed in Japanese Patent Laid-Open Nos. 59-91275 and 59-91277. This will be described with reference to FIG. 5 by taking an automobile door as an example. Reference numeral 1 denotes a vehicle body, and 2 denotes a door as a vehicle body constituent portion that is assembled to an opening 3 formed in the vehicle body 1 via a hinge (not shown), and includes a door body 4 and a window glass 5. Reference numeral 6 denotes a locking mechanism for maintaining the closed state of the vehicle body 1 and the door 2, which is constituted by a latch 8 which is engaged with the striker 7 when the door 2 is closed. This locking mechanism 6
An outside handle 9, an inside handle 10, a lock knob 11, and a cylinder lock 13 are connected to the. The cylinder lock 13 is a housing 15 as an outer cylinder fixed to the door body 4, a rotor 16 as an inner cylinder rotatably mounted on the housing 15, and a rotatably penetrating through the rotor 16 and the housing 15. A plurality of mounted tumblers (not shown), and by inserting a key plate (not shown) into the key insertion opening 17 of the rotor 16 at the neutral position a, the housing 15 and the rotor 16 formed by the plurality of tumblers. Is disengaged, the rotor 16 is rotated from the neutral position a to the locking position b by approximately 90 degrees in the direction of the arrow X, and the neutral position a is released to the unlocking position c.
It is designed to be rotated approximately 90 degrees in the arrow Y direction (the direction opposite to the arrow X direction). Rotor 16 with this key plate
The rotation of the lock mechanism 6 to the locking position b switches the lock mechanism 6 from the unlock to the lock, and the engagement between the striker 7 and the latch 8 is maintained regardless of the closing operation of the outside handle 9 or the inside handle 10. Then, the door 2 is held closed. On the contrary, the rotor with the key plate
By rotating 16 to the unlocking position c, the lock mechanism 6 is switched from the lock to the unlock, and the striker 7 and the latch 8 are moved.
The engagement with is released by the opening operation of the outside handle 9 or the inside handle 10, and the door 2 is opened. Therefore, in this structure, the key plate is inserted into the key insertion opening 17, pivoted from the neutral position a to the locking position b, and then returned to the neutral position a, and the key plate is pulled out from the key insertion opening 17. By the operation, the door 2 is closed and held while the lock mechanism 6 is engaged and held, and theft can be prevented. However, there are still accidents in which the locking mechanism 6 is unlocked by an illegal means, the door 2 is opened, and the vehicle is stolen. For this reason, there is known a theft prevention device that issues an alarm when the door 2 is opened by an unauthorized operation without unlocking the cylinder lock 13 with a key plate. In this anti-theft device, in addition to the above-mentioned structure, as shown in the figure, a magnet 19 is provided on the rotor 16 of the cylinder lock 13, and the magnet 19 is provided at each of the vicinity of the stop position when the cylinder lock 13 is locked and unlocked. , Reed switches 20 and 21 forming a magnetically sensitive switch are arranged, and the magnet 19 does not come into contact with the contact points of the reed switches 20 and 21 when the cylinder lock 13 is locked or unlocked.
It is turned on by the magnetic force of the magnet 19 of 21 and the cylinder lock 13
It is designed to detect the locking / unlocking of. A switch 22 detects whether the door 2 is open or closed. Further, the lead switches 20 and 21 for detecting the lock / unlock and the switch 22 for detecting the opening / closing of the door.
Are connected to the input ports 23a, 23b, 23c of the control unit 23, as shown in FIG. A warning member 24 such as a buzzer is connected to the output port 23d of the control unit 23. The control unit 23, for example, when the lead side switch 20 on the locking side is turned on, sets the potential of the output port 23d to a high level, and when the lead switch 21 on the unlocking side is turned on,
It is configured by a flip-flop that constitutes a memory circuit for setting the potential of the output port 23d to a low level, and a combination of a NOT gate, an AND gate, an OR gate, and the like. That is, this control unit 23
If the door open detection signal from the door open / close detection switch 22 is supplied between the time when the lock detection signal is applied by the lead switch 20 and the unlock detection signal is applied by the lead switch 21, the warning member 24 is displayed. It supplies an output and gives an alarm.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the latter anti-theft device described above, when the door 2 is closed and the cylinder lock 13 is locked, if a magnet is applied from the outside of the vehicle around the cylinder lock 13, the unlocking is performed. The side lead switch 21 is actuated, and an unlock detection signal is supplied to the control unit 23. Therefore, the cylinder lock 13
Without unlocking with the key plate, apply a magnet (not shown) around the cylinder lock 13 from the outside of the vehicle, operate the lead switch 21 on the unlocking side, and release the warning control by the control unit 23. Door 2 due to illegal operation
There is a risk that the door will be opened and theft will be encountered.

Therefore, the present invention provides an anti-theft device for a vehicle, which can raise an alarm and improve the anti-theft property when the door is opened without performing a regular unlocking operation of the locking mechanism.

Means for Solving Problems In the present invention, a magnetically sensitive switch that detects the operation of either locking or unlocking, and the magnetically sensitive switch is turned on in response to the locking or unlocking operation. A contact switch that is turned off within a range including the neutral position and a warning member that ensures a warning when the contact switch is off are connected.

In the locked state of the locking mechanism, even if a magnet is applied from outside the vehicle to activate the magnetically sensitive switch illegally, the contact type switch is turned off, ensuring a warning control that electrically informs theft of the vehicle. To do.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings by attaching the same reference numerals to the same portions as those of the conventional structure.

1 to 4, this anti-theft device is constructed by locking and unlocking a cylinder lock 13 as a locking mechanism that is assembled to a door body 2 that constitutes a vehicle body component with a key plate (not shown). The lock mechanism 6 is locked / unlocked, and the lock / unlock of the cylinder lock 13 is detected by the lead switches 20 and 21 which are magnetically sensitive switches, and the control unit 23 performs warning control based on this detection signal. The basic structure such as is the same as the conventional one.

Here, as shown in FIGS. 1 and 2, the lead switches 20, 21
Has a normally open contact structure, and these lead switches 2
A contact type switch 30 is connected in series to each of 0 and 21. In other words, while the contact switch 30 is on,
When the lead switch 20 on the lock side is turned on, a lock detection signal is supplied to the control unit 23. Similarly, when the lead switch 21 on the unlocking side is turned on while the contact switch 30 is on, the unlocking detection signal is supplied to the control unit 23. On the other hand, as shown in Figs. 2 and 3, the cylinder lock 1
In the center of the rear end surface of the rotor 16 in FIG.
A large-diameter portion 31 protruding rearward from is provided. This large diameter part
31 A spindle part 32 with a smaller diameter than the large diameter part 31
Is protruding. Left and right convex portions 33 are provided to project rearward from the peripheral surface of the large diameter portion 31. A required clearance 34 is set between the left and right convex portions 33 and the peripheral surface of the support shaft portion 32. A closed annular groove 35 is formed on the peripheral surface of the tip of the support shaft portion 32.
The large diameter portion 31, the support shaft portion 32, and the left and right convex portions 33 are formed of an insulating material. In addition, the contact type switch 30 described above,
A movable contact 36 attached to the rotor 16 of the cylinder lock 13 and a fixed contact 38 attached to the housing 15 of the cylinder lock 13 via the switch cover 37 are provided, and the lock / unlock operation of the cylinder lock 13 is performed. , Is turned on within a required range including the detection areas (locking / unlocking positions b and c) of the lead switches 20 and 21, and is turned on within a required range including the neutral position a. . The movable contact 36 has a mounting portion 39 and a mounting portion.
The movable contact portions 40 and 41 are provided extending from the center of the mounting portion 39 to the left and right sides from the center 39 at substantially equal distances. An insertion hole 42 is formed substantially in the center of the mounting portion 39, and left and right recesses 43 are cut out at the edge of the insertion hole 42. This movable contact 36
Clear the spiral spring 44 on the support shaft 32.
After external fitting via the 34, the insertion hole 42 of the mounting portion 39 is inserted into the support shaft portion 32.
And the left and right concave portions 43 of the mounting portion 39 are fitted into the left and right convex portions 33, and the mounting portion 39 has a larger diameter portion than the closed annular groove 35 of the support shaft portion 32.
A state in which the retaining ring 45 is attached to the closed annular groove 35 in the state of being positioned on the 31 side, so that the spring 44 urges the fixed contact 38 side and the pivot 32 cannot rotate. It is mounted so as to rotate together with the rotor 16. The fixed contact 38 is arranged in the rear of the movable contact 36 relative to each other, and on the insulating substrate 46 attached to the inner bottom surface of the bottomed cylindrical switch cover 37, the fixed contact portion 47, 48 and multiple contact parts 49,50,51,52,53,54,55 and strip wiring parts 56,57,5
The printed circuit board is composed of 8 and 59 arranged in a desired pattern. Specifically, the fixed contact parts 47 and 48 are used for the rotor 16 when the cylinder lock 13 is locked and unlocked.
The movable contact parts 40, 41 that rotate together with the lead switch 20,
The sliding contact is set only within the required range including 21 detection areas. On both sides of one of the fixed contact portions 47 of the fixed contact portions 47, 48, two contact portions 49, 50 of the contact portions 49 to 55 are respectively provided with strip wiring portions 56,
Connected through 57. These two contact parts
The lead side switch 20 on the locking side is connected to one of the contact portions 49 of 49 and 55 and the contact portion 51 arranged in the circumferential direction of the contact portion 49. The lead switch 20 is arranged at a position where it is turned on by the magnetic force of the magnet 19 on the large diameter portion 31 when the cylinder lock 13 is locked. The unlocking side lead switch 21 is connected to the other contact portion 50 of the two contact portions 49, 50 and the contact portion 52 arranged in the circumferential direction of the contact portion 50. There is. This reed switch
21 is a magnet 19 on the large diameter portion 31 when the cylinder lock 13 is unlocked
It is arranged at a position where it is turned on by the magnetic force of.
One end of an electric wire 60 connected to the input port 23a of the control unit 23 is connected to the contact portion 53 connected to the contact portion 51 via the strip wiring portion 58. In addition, the contact unit 54 connected to the contact unit 52 via the strip wiring unit 59 has a control unit.
One end of an electric wire 61 connected to another input port 23b of 23 is connected. One end of an electric wire 62 connected to the power source B is connected to the contact portion 55 that is continuously provided on the outer edge of the other fixed contact portion 48. The other ends of these electric wires 60 to 62 are from between the back surface of the fixed contactor 38 and the inner bottom surface of the switch cover 37 via the insertion hole 63 at the substantially central portion of the bottom portion of the switch cover 38,
It is pulled out to the outside of the switch cover 37. The fixed contactor 38 penetrates the other end of each of the electric wires 60 to 62 connected to the fixed contactor 38 from the inner bottom surface side of the switch cover 37 into the insertion hole 63, and the middle portion of these electric wires 60 to 62 to the switch cover 37. Locating projections that are provided between the inner bottom surface and the back surface of the fixed contact 38 and that are formed by notching in the peripheral surface of the fixed contact 38 and project in the axial direction of the inner wall surface of the switch cover 37.
While fitting to 65, the fixed contact 38 is moved to the inner bottom surface side of the switch cover 37, and the mounting pin 67 protruding from the inner bottom surface of the switch cover 37 is inserted into the mounting hole 68 formed in the fixed contact 38, It is fixed to the switch cover 37 by crushing the tip portion of the mounting pin 67 protruding from the fixed contact 38. The switch cover 37, to which the fixed contact 38 is fixed, fits the front half of the locate protrusion 65 into the locate recess 69 formed in the rear portion of the peripheral surface of the housing 15 of the cylinder lock 13 and at the same time the tip opening of the switch cover 37. Is fitted to the rear portion of the housing 15 closely, and the flange portion 70 projecting on the outer periphery of the switch cover 37 is fastened to the flange portion 71 projecting on the outer periphery of the housing 15 with bolts 72.
It is fixed to the housing 15. 73 is an insulating substrate
It is a support shaft escape hole formed in a substantially central portion of 46.

The operation of the structure of the above embodiment will be described.

(1) Locking operation of the cylinder lock 13 In the neutral state of the cylinder lock 13 shown in FIG. 2, when a key plate (not shown) is inserted into the key insertion opening 17 of the rotor 16 and rotated in the arrow X direction, it is movable. As shown in FIG. 4, the contact 36 rotates with the rotation of the rotor 16 about the support shaft 32 from the solid line position to the position indicated by the alternate long and short dash line. , 41 make sliding contact with the fixed contact portions 47, 48 and the contact type switch 30 is turned on. Continued,
By the rotation of the key plate in the direction of the arrow X, the movable contact portions 40, 41 are rotated by the rotor 16 to move the fixed contact portions 47, 48 on the fixed contact portions 47, 48 from the position indicated by the phantom line (the cylinder lock 13). Of the rotor 16 is rotated to the locking position b), and the magnet 19 on the rotor 16 has a required gap in the lead switch 20 on the locking side while the contact type switch 30 is in the ON operation. The reed switch 20 is turned on by the magnetic force of the magnet 19. As a result, the lock detection signal of the lead switch 20 is supplied to the control unit 23, and the control unit 23 is set to the warning control state. Here, the rotation of the rotor 16 in the cylinder lock 13 to the locking position b causes the locking mechanism 6 to switch from unlock to locking, the engagement between the striker 7 and the latch 8 is maintained, and the door 2 is closed. It will be clear that it will be held.
After that, when the key plate in the locked position b is rotated in the direction of the arrow Y, the movable contacts 36, 41 move from the position indicated by the alternate long and short dash line to the position indicated by the solid line, and the movable contact parts 40, 41 move to the fixed contact part 4.
The contact type switch 30 is turned off after moving away from 7,48. Subsequently, when the key plate is rotated in the Y direction and stopped at the neutral position a, the movable contact 36 returns to the state shown by the solid line.
By removing the key plate from the key insertion opening 17 at the neutral position a, a series of locking operations of the cylinder lock 13 is completed.

(2) When unlocking the cylinder lock 13 By inserting the key plate into the key insertion opening 17 in the neutral state and rotating in the direction of the arrow Y, the movable contact 36
Rotates from the solid line position shown in FIG. 4 to the dotted line position, and the contact type switch 30 is turned on at this dotted line position. By the subsequent rotation of the key plate in the Y direction, the movable contact portions 40, 41
Slides on the fixed contact parts 47, 48 from the dotted line position to the virtual line position, and the magnet 19 approaches the lead switch 21 on the unlocking side with a required gap while the contact type switch 30 remains on. Then, the lead switch 21 is turned on, the unlock detection signal is supplied to the control unit 23, and the warning control state of the control unit 23 in the above (1) is released.
Here, the rotor 16 of the cylinder lock 13 is rotated to the unlock position c, the lock mechanism 6 is switched from the lock to the unlock position, and the striker 7 is operated by operating the outside handle 9 from the outside of the vehicle. And the latch 8 are disengaged, and the door 2 can be opened. Then, by rotating the key plate in the direction of arrow X from the unlocked position c and withdrawing it from the key insertion port 17 at the neutral position a, a series of unlocking operations of the cylinder lock 13 is completed. At this time, when the movable contact 36 moves from the dotted line position to the solid line position, the movable contact parts 40, 41
Is separated from the fixed contact portions 47, 48, the contact type switch 30 is turned off, and the movable contact 36 is returned to the solid line position.

(3) In case of unauthorized unlocking operation From the outside of the vehicle to the magnet around the cylinder lock 13 between the locking operation in the above (1) and before the unlocking operation in the above (2), the lead on the unlocking side. Even if the switch 21 is turned on, the contact type switch 30 is turned off during the return from the locking position b to the neutral position a in the above (1), so that the reed switch 21 is unlocked by turning it on. The detection signal is not supplied to the control unit 23.
That is, when the door 2 is in the locked state, even if the lead switch 21 on the unlocking side is illegally turned on, the locking operation of the cylinder lock 13 ensures the warning control set in the control unit 23. be able to. As a result, after the lead switch 21 on the unlocking side is turned on by a magnet from outside the vehicle, the lock mechanism 6 is disengaged illegally and the alarm can be issued when the door 2 is opened.

Further, according to the structure of the above-described embodiment, as shown in FIG. 3, the switch cover 37 separates the space 74 at the rear of the housing 15 of the cylinder lock 13 in a sealed state. Movable contactor 36 mounted on rotor 16 and housing 15
Since the contact-type switch 30 configured by the fixed contactor 38 attached to the contact-type switch 30 is stored and arranged, the contact-type switch 30 can be waterproofed. That is, even if water that has entered the door body 4 from the door waist portion 18 covers the contact type switch 30, the water is prevented from entering the space portion 74 by the switch cover 37 and the housing 15. It As a result, the movable contact 36 and the fixed contact 38 are not exposed to water.

Moreover, looking at the assembly of the contact type switch 30, the fixed contactor mounted on the rotor 16 with the movable contactor 36 and attached to required electric parts such as the lead switches 20 and 21 and the electric wires 60, 61 and 62. After attaching 38 to the switch cover 37,
By fastening the switch cover 37 to the housing 15 with the bolts 72, the contact type switch 30 can be assembled to the cylinder lock 13, and the assembling work becomes easy.

In the above-described embodiment, the lead switches 20 and 21 are illustrated and described as the magnetically sensitive switches, but the similar effect can be obtained even with the proximity switches. In the case of this proximity switch, it is applicable to a type in which a ferromagnetic material such as iron is turned on / off.

The present invention can also be applied to a locking mechanism having a structure in which only one of locking and unlocking can be performed by a key plate, such as a cylinder lock in a trunk lid.

As described above, according to the present invention, in the locked state, the magnet is applied from the outside of the vehicle, and the contact type switch is off even if the magnetically sensitive switch is illegally operated. By the operation, it is possible to secure the alarm control that informs the theft of the vehicle which is electrically set. As a result, an alarm can be issued when an opening / closing body such as a side door, a back door, a trunk lid or the like is opened without performing a regular unlocking operation of the locking mechanism, and thus the anti-theft property can be improved. There is a new effect that can be done.

[Brief description of drawings]

1 is an electric circuit diagram showing an embodiment of the present invention, FIG. 2 is an exploded perspective view of the same embodiment, FIG. 3 is a sectional view of the same embodiment in an assembled state, and FIG. The figure is an explanatory view of the operation of the present invention,
FIG. 5 is a schematic configuration diagram showing a conventional vehicle antitheft device, and FIG. 6 is an electric circuit diagram of the conventional example. 2 ... Door (car body component), 13 ... Cylinder lock (locking mechanism), 20,21 ... Reed switch (magnetically sensitive switch), 30 ... Contact type switch.

Claims (1)

(57) [Claims] 1. A magnetically sensitive switch for detecting the operation of either locking or unlocking, and the magnetically sensitive switch being turned on in response to the locking or unlocking operation and turned off within a range including a neutral position. An anti-theft device for an automobile, characterized in that a contact type switch that is connected to the contact type switch and a warning member that ensures a warning when the contact type switch is off are connected.